Cyclic and Non-Cyclic Photophosphorylationn in Plants

Cyclic and Non-Cyclic Photophosphorylation in Plants:

Difference # Cyclic Photophosphorylation:

1. It is found dominantly in bacteria.

2. It involves photosystem I only.

3. Electrons move in a closed circle. Electron expelled from chlorophyll (P700) returns to it after passing through a series of electron accep­tors in an ETS.

4. It is not involved in the photolysis of water and therefore, no oxygen is involved.

5. It sythesises only ATP, reduced NADP, i.e., NADPH2 is not synthesised.

6. It operates under low light intensity, anaerobic conditions and the poor availability of CO2.

Difference # Non-Cyclic Photophosphorylation:

1. This is dominant in green plants.

4. It is not involved in the photolysis of water and therefore, no oxygen is involved.

5. It sythesises only ATP, reduced NADP, i.e., NADPH2 is not synthesised.

6. It operates under low light intensity, anaerobic conditions and the poor availability of CO2.

Difference # Non-Cyclic Photophosphorylation:

1. This is dominant in green plants.

6. It takes place under optimum light, aerobic conditions and in the presence of sufficient CO2.